Jabruson Motion / Chainsaw operator cutting down African oil palm ( Elaeis guineensis) in a plantation within the Protected Area of the Leuseur Ecosystem, part of a programme of habitat restoration, Tenggulun, Aceh Tam...

Alex Mustard / Colourful reef scene with Coral grouper (Cephalopholis miniata), map puffer (Arothron mappa) and Panda butterflyfish (Chaetodon adiergastos). Tank Reef, Fiabacet Islands, Misool, Raja Ampat, Indonesia...

Chris Mattison / Horned frog (Ceratophrys sp) in shallow water, captive occurs in South America.

Klein & Hubert / Chinstrap penguin (Pygoscelis antarcticus) walking with full belly and iceberg in background, Antarctica

Klein & Hubert / Chinstrap penguin (Pygoscelis antarcticus) walking with full belly at sunset, Antarctica

Jabruson / Old abandoned Oil Palm trees (Elaeis guineensis), on the edge of plantation limits, at the edge of Korup National Park, South West Cameroon.

Alex Mustard / 2020VISION / Female Grey seal (Halichoerus grypus) juvenile swimming over kelp, off Farne Islands, Northumberland, England, UK, July. Did you know? Grey seal milk is 60% fat and although they are fed milk for just...

Kerstin Hinze / Fat / Edible dormouse (Glis glis) Lower Saxony, Germany, captive

Stephen Dalton / Horned frog (Ceratophrys ornata) sitting on leaves, controlled conditions, from South America

Christophe Courteau / Mountain Gorilla (Gorilla beringei) dominant male silver back sitting amongst vegetation. 2700 metres above sea level in Volcanoes National Park, Rwanda. short dry season, February

Rolf Nussbaumer / Fat dormouse in bird nestbox {Glis glis} Switzerland.

Ingo Arndt / Fat dormouse in flowering tree {Glis glis} Germany

Ingo Arndt / Fat dormouse in oak tree {Glis glis} Germany

Jean E. Roche / Fat dormouse teeth {Glis glis} France

Anup Shah / Common zebra about to give birth (Equus quagga) Masai Mara NR, Kenya

Yva Momatiuk & John Eastcott / Southern Elephant Seal (Mirounga leonina) pups, fat and docile weaners stay together for company and reassurance, St. Andrews Bay, South Georgia Island

Fred Bavendam / Guineafowl Pufferfish (Arothron meleagris) in its golden color phase puffed up off of Tower Island, Galapagos Islands, Ecuador

Mitsuaki Iwago / Harp Seal (Phoca groenlandicus) pup portrait, Gulf of St Lawrence, Canada

Jiri Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) pouch with young inside Captive - Photographed at the University of Western Australia.

Jiri Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) pouch with young inside Captive - Photographed at the University of Western Australia.

Jiri Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) Goongarrie NP, Goldfields Region, Western Australia.

Jiri Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) feeding on a spider, Goongarrie NP, Goldfields Region, Western Australia.

Jiri Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) Goongarrie NP, Goldfields Region, Western Australia.

Jiri Lochman / Fat-tailed pseudantechinus (Pseudantechinus macdonnellensis) feeding on a native cockroach - Picture Hill area, in Great Sandy Desert, Western Australia.

Jiri Lochman / Fat-tailed pseudantechinus (Pseudantechinus macdonnellensis) Picture Hill area, in Great Sandy Desert, Western Australia .

Marie Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) Goongarrie NP in Goldfields Region of Western Australia.

Marie Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) - Goongarrie NP, Goldfields Region, Western Australia.

Marie Lochman / Fat-tailed dunnart (Sminthopsis crassicaudata) Goongarrie NP, Goldfields Region, Western Australia.

Andrew Walmsley / Oil palm (Elaeis guineensis) tree plantation, North Sumatra.

Bruno D'Amicis / Edible dormouse (Glis glis) on old-growth Beech (Fagus sylvatica) forest tree UNESCO World Heritage Site. Abruzzo, Lazio and Molise National Park, Italy. July 2013

Bruno D'Amicis / Edible dormouse (Glis glis) on old-growth Beech (Fagus sylvatica) forest tree, UNESCO World Heritage Site. Abruzzo, Lazio and Molise National Park, Italy. July 2013

Nick Upton / Male Thick-legged / Swollen-thighed flower beetle (Oedemera nobilis) feeding on nectar and pollen on a Meadow buttercup (Ranunculus acris) flower, England, UK. May.

Tui De Roy / Galapagos land iguana (Colonophhus subcristatus), Seymour Island, Galapagos

Mark Taylor / Overweight ginger cat.

David Tipling / Long-tailed tits (Aegithalos caudatus) on fat ball feeder in garden Norfolk, England, UK. February.

David Tipling / Long-tailed tits (Aegithalos caudatus) on fat ball feeder in garden Norfolk, England, UK. February.

David Tipling / Grey squirrel (Sciurus carolinensis) in wood North Norfolk, England, UK.

Daniel Heuclin / Freshwater pufferfish (Pao sp) inflated on hand. Belitung, Sumatra, Indonesia. Sequence 2/2

David Fleetham / Trumpetfish (Aulostomus maculatus) swimming behind Yellow boxfish (Ostracion cubicus) as a blind to ambush prey. Yap, Micronesia.

Georgette Douwma / Striped puffer (Arothron manilensis) with deformed 'nostrils'. Puerto Galera, Philippines.

Georgette Douwma / Juvenile of a Whitespotted puffer (Arothron hispidus) Puerto Galera, Philippines.

Georgette Douwma / Map puffer (Arothron mappa) at rest on a sponge. West Papua, Indonesia.

Klein & Hubert / Giant panda (Ailuropoda melanoleuca) subadult feeding on bamboo whilst lying on back,, Sichuan Province, China. Captive

Karine Aigner / Biologist blowing on the breast of a Hermit thrush (Catharus guttatus) in order to separate feathers to see how much fat the bird has gained. Fat gain is important for migratory birds as they use a lo...

Karine Aigner / Research study assistant helping release a Hermit thrush (Catharus guttatus) from a mist net. The Thrush might be a possible cohort individual for a study on fat gain and antioxidants in diet before m...

Karine Aigner / Research study assistant helping release a Hermit thrush (Catharus guttatus) from a mist net. The Thrush might be a possible cohort individual for a study on fat gain and antioxidants in diet before m...

Karine Aigner / Volunteer, helping release a Hermit thrush (Catharus guttatus) from a mist net. The Thrush might be a possible cohort individual for a study on fat gain and antioxidants in diet before migration. Bloc...

Richard Robinson / Blackspotted Puffer (Arothon nigropunctatus) at South Minerva Reef / Teleki Tonga, a disputed territory in the South Pacific between Tonga and Fiji.